UPDATE: Ari Emanuel clearly doesn’t know when to leave well enough alone. NBC’s Rock Center With Brian Williams featured a mostly lighthearted profile of him and his two bros Friday night timed to the publication of Brothers Emanuel: A Memoir Of An American Family. Williams assembled Ari, the WME talent agency chief; Rahm, current mayor of Chicago and former Obama Chief of Staff; and Zeke, bioethicist doctor and the book’s author. But Ari followed up with a legal letter to the network complaining about “contentious” nature of Williams’ questioning. You be the judge if Ari needs to develop a thicker skin: